Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following shares were not included in the computation of diluted net loss per share (in thousands):

	Years Ended December 31,
	2014	2013	2012
Shares issuable under Equity Incentive Plan	6,193	6,722	7,091
Shares issuable upon the conversion of warrants	75	75	260
Total anti-dilutive securities	6,268	6,797	7,351